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Preparation and application of conductive carbon film-coated calcium nitride compound serving as anode material of lithium battery

A technology of negative electrode material and conductive carbon film is applied in the field of preparation and application of negative electrode material of lithium battery coated with nitrogen-calcium compound by conductive carbon film. Achieving the effects of good electrical conductivity, improved electrochemical kinetic performance, and reduced cost

Inactive Publication Date: 2011-06-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such as SnO 2 , WO 2 , MoO 2 , VO 2 ,TiO 2 , Li x Fe 2 o 3 , Li 4 Ti 5 o 12 , Li 4 mn 5 o 12 etc., but generally the conductivity is not as good as that of graphite electrodes, and the high-rate discharge performance of lithium-ion batteries with metal oxides as negative electrodes is poor

Method used

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  • Preparation and application of conductive carbon film-coated calcium nitride compound serving as anode material of lithium battery
  • Preparation and application of conductive carbon film-coated calcium nitride compound serving as anode material of lithium battery

Examples

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Embodiment 1

[0029] Example 1: Carbon coated Ca 3 N 2 preparation

[0030] Take metal calcium particles with a purity of 99.99% and heat to 850 o After C is melted, it is sprayed with high-purity nitrogen (purity 99.999%) and sprayed into polyethylene glycol liquid. The calcium mist reacts with nitrogen gas in a nitrogen atmosphere to form calcium nitride (Ca 3 N 2 ) microspheres, which form spherical powder after cooling in a polyethylene glycol liquid with a molecular weight of 200 and a purity of 99%. At the same time, the polyethylene glycol in contact with calcium nitride is carbonized, and the gas generated during the carbonization process makes the carbon The membrane swells, forming a carbon-coated calcium nitride material primary.

[0031] Filter out carbon-coated Ca 3 N 2 The primary product is refined by calcining again in an atmosphere of high-purity nitrogen with a purity of 99.999% for 2 hours, and the temperature is controlled at 700 o Below C, the residual calcium in...

Embodiment 2

[0032] Example 2: Carbon coated Ca 3 N 2 Lithium battery with negative electrode (1)

[0033] Take calcium metal with a purity of 99.99%, at 850 o After C is melted, it is sprayed with high-purity nitrogen (purity 99.999%) and sprayed into polyethylene glycol liquid. The calcium mist reacts with nitrogen gas in a nitrogen atmosphere to form calcium nitride (Ca 3 N 2 ) Microspheres form spherical powder after cooling in polyethylene glycol liquid with a molecular weight of 600 and a purity of 99%. At the same time, the polyethylene glycol in contact with calcium nitride is carbonized, and the gas generated during the carbonization process makes the carbon The membrane swells, forming a carbon-coated calcium nitride material primary.

[0034] Filter out carbon-coated Ca 3 N 2 The primary product is refined by calcining again in an atmosphere of high-purity nitrogen with a purity of 99.999% for 3 hours, and the temperature is controlled at 650 o Below C, the residual calci...

Embodiment 3

[0038] Example 3: Carbon-coated Ca 3 N 2 Lithium battery with negative electrode (2)

[0039] Take calcium metal with a purity of 99.99%, at 850 o After C is melted, it is sprayed with high-purity nitrogen (purity 99.999%) and sprayed into polyethylene glycol liquid. The calcium mist reacts with nitrogen gas in a nitrogen atmosphere to form calcium nitride (Ca 3 N 2 ) Microspheres form spherical powder after cooling in polyethylene glycol liquid with a molecular weight of 800 and a purity of 99%. At the same time, the polyethylene glycol in contact with calcium nitride is carbonized, and the gas generated during the carbonization process makes the carbon The membrane swells, forming a carbon-coated calcium nitride material primary.

[0040] Filter out carbon-coated Ca 3 N 2 The primary product is refined by calcining again in an atmosphere of high-purity nitrogen with a purity of 99.999% for 3 hours, and the temperature is controlled at 650 o Below C, the residual calci...

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Abstract

The invention relates to preparation and application of an anode material of a lithium battery and aims to provide preparation and the application of a conductive carbon film-coated calcium nitride compound serving as the anode material of the lithium battery. The preparation method comprises the following steps of: after calcium metal is molten, spraying into polyethylene glycol liquid by using high purity nitrogen, and performing a reaction of the calcium fog drops and nitrogen in an nitriding atmosphere to obtain Ca3N2 microspheres so as to obtain a carbon-coated calcium nitride material primary product; and after filtering out a carbon-coated calcium nitride material, calcining for 2 to 3 hours again in the high purity nitrogen atmosphere and carrying out refining to obtain carbon-coated Ca3N2, or calcining for 2 to 3 hours again in vacuum to obtain a carbon-coated Ca3N2-Ca2N mixture. In the invention, a conductive carbon film is formed on the surface of Ca3N2 or Ca3N2-Ca2N, is favorable for stability of an electrode structure, has high heat stability and low cost, is easy to prepare and has no pollution. The conductive carbon film prepared by a spraying method has the advantages of uniform thickness and high conductivity. The electrode polarization is reduced. The speed and the capacity of the lithium battery are improved.

Description

technical field [0001] The invention relates to the preparation and application of a negative electrode material for a lithium ion battery, in particular to a method for preparing a negative electrode material for a lithium battery with a conductive carbon film coated with a nitrogen-calcium compound, and a lithium ion battery prepared using the negative electrode material. Background technique [0002] Lithium-ion batteries have the advantages of light weight, large capacity, and no memory effect, so they have been widely used. Many digital devices now use lithium-ion batteries as power sources. The energy density of lithium-ion batteries is very high, its capacity is 1.5 to 2 times that of nickel-metal hydride batteries of the same weight, and its advantages such as low self-discharge rate and no toxic substances are important reasons for its wide application. In 1990, Nagoura and others in Japan developed a negative electrode with petroleum coke and LiCoO 2 Lithium-ion...

Claims

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Application Information

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IPC IPC(8): H01M4/1397H01M10/0525
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 李洲鹏刘宾虹
Owner ZHEJIANG UNIV
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